linux-kernel - Re: [PATCH 5/6] perf_counter: kerneltop: mmap

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20090325125407.GA32744@elte.hu>
Date:	Wed, 25 Mar 2009 13:54:07 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	linux-kernel@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...radead.org>,
	Wu Fengguang <fengguang.wu@...el.com>
Subject: Re: [PATCH 5/6] perf_counter: kerneltop: mmap_pages argument


* Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:

> On Wed, 2009-03-25 at 13:35 +0100, Ingo Molnar wrote:
> 
> > > Also, when mixing streams (events,mmap) is a single: you missed 
> > > 'n' events still good?
> > 
> > How would such mixing work? Multiple counters streaming into the 
> > same mmap area?
> 
> No basically having overflow events and mmap-vma changed events in 
> a single output stream.

ah, and i missed the impact of variable size records - that too 
makes it somewhat impractical to emit overflow records in situ. (the 
kernel does not really know the precise start of the previous 
record, typically.)

	Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/